100% satisfaction gurantee - we are pleased to be able to provide a 30 days 100% satisfaction guarantee .if you have any questions,please contact us !. Indoor And Outdoor Training:Designed with limited flight for practicing every shot even with limited space and hitting distance.the max distance about 50-65 yards. Weighted Foam Balls : The weighted ball(8.5-10 gram) simulates real feeling of hitting golf balls .designed to improve your all swing skills. True Experience: 336 surface holes ensure golfer get true spin & accurate distance every shot. High Performance:The ball Made of compressed foam material features good hardness and strength. 100% Foam.